Editing Planetary boundary layer (section)

==Nocturnal and diurnal conditions==
The planetary boundary layer is different between day and night. During the day [[Inversion (meteorology)|inversion layer]]s formed during the night are broken up as a consequence of the turbulent rise of heated air.{{sfn|Foken|2017|p=7}} The boundary layer stabilises "shortly before sunset" and remains so during the night.{{sfn|Foken|2017|p=7}} All this make up a daily cycle.{{sfn|Foken|2017|p=7}} During winter and cloudy days the breakup of the nighttime layering is incomplete and atmospheric conditions established in previous days can persist.{{sfn|Foken|2017|p=7}}{{sfn|Foken|2017|p=8}} The breakup of the nighttime boundary layer structure is fast on sunny days.{{sfn|Foken|2017|p=8}} The driving force is convective cells with narrow updraft areas and large areas of gentle downdraft.{{sfn|Foken|2017|p=8}} These cells exceed 200–500 m in diameter.{{sfn|Foken|2017|p=8}}